LOS ANGELES--(BUSINESS WIRE)--Puma Biotechnology, Inc. (NASDAQ: PBYI), a biopharmaceutical company,
announced financial results for the fourth quarter and year ended
December 31, 2017. Unless otherwise stated, all comparisons are for the
fourth quarter and full year 2017, compared to the fourth quarter and
full year 2016.

On July 17, 2017, Puma Biotechnology received approval from the U.S.
Food and Drug Administration (FDA) for NERLYNX® (neratinib) for the
treatment of early stage HER2-positive breast cancer following adjuvant
trastuzumab-based therapy, and the Company began shipment to wholesalers
at the end of July 2017. The Company reported net revenue from initial
sales of NERLYNX of approximately $20.1 million in the fourth quarter
and $26.2 million for the full year 2017.

Based on accounting principles generally accepted in the United States
(GAAP), Puma reported a net loss applicable to common stock of $64.1
million, or $1.71 per share, for the fourth quarter of 2017, compared to
a net loss of $72.7 million, or $2.04 per share, for the fourth quarter
of 2016. Net loss applicable to common stock for the full year 2017 was
$292.0 million, or $7.85 per share, compared to $276.0 million, or $8.29
per share, for the full year 2016.

Non-GAAP adjusted net loss was $38.6 million, or $1.03 per share, for
the fourth quarter of 2017, compared to non-GAAP adjusted net loss of
$43.4 million, or $1.22 per share, for the fourth quarter of 2016.
Non-GAAP adjusted net loss for the full year 2017 was $183.3 million, or
$4.93 per share, compared to non-GAAP adjusted net loss of $158.8
million, or $4.77 per share, for the full year 2016. Non-GAAP adjusted
net loss excludes stock-based compensation expense, which represents a
significant portion of overall expense and has no impact on the cash
position of the Company. For a reconciliation of GAAP net loss to
non-GAAP adjusted net loss and GAAP net loss per share to non-GAAP
adjusted net loss per share, please see the financial tables at the end
of this news release.

Net cash used in operating activities for the fourth quarter of 2017 was
$35.6 million. Net cash used in operating activities for the full year
2017 was $172.5 million. At December 31, 2017, Puma had cash and cash
equivalents of $81.7 million, compared to cash and cash equivalents of
$194.5 million and marketable securities of $35.0 million at December
31, 2016. In November 2017, Puma announced that it entered into a loan
agreement with Silicon Valley Bank and Oxford Finance for a term loan of
up to $100 million, subject to funding in two tranches. Puma received
gross proceeds of $50 million from the first tranche of the credit
facility upon closing on October 31, 2017.

Due to unanticipated delays by Puma surrounding certain disclosures
related to tax and tax reform, Puma needs more time to complete its
financial statements and to prepare its Form 10-K for the fiscal year
ended December 31, 2017. As a result, Puma is not in a position to file
its Form 10-K within the prescribed time period without unreasonable
expense and effort. Puma expects that its Form 10-K will be filed within
the 15 day period specified by Rule 12b-25(b)(2)(ii) of the Securities
Exchange Act of 1934, as amended.

“With the FDA approval and successful launch of NERLYNX for extended
adjuvant treatment of HER2-positive early stage breast cancer in the
United States, 2017 was truly a milestone year for Puma Biotechnology,”
said Alan H. Auerbach, Chairman, Chief Executive Officer and President
of Puma. “Further, we presented results of our ongoing studies at major
conferences, including our Phase III ExteNET study at the European
Society for Medical Oncology 2017 Congress, our Phase II CONTROL study
at the 2017 San Antonio Breast Cancer Symposium, and our Phase II SUMMIT
study at the 2017 American Association for Cancer Research Annual
Meeting.”

Mr. Auerbach added, “During 2018, we anticipate the following key
milestones for Puma: (i) submitting for a re-assessment of the Marketing
Authorisation Application for neratinib by the Committee for Medicinal
Products for Human Use (CHMP) of the European Medicines Agency (EMA) in
the first quarter of 2018; (ii) reporting updated Phase I/II data from
neratinib plus Kadcyla (T-DM1) in HER2-positive metastatic breast cancer
trial in the second quarter of 2018; (iii) reporting data from a Phase
III trial in third-line metastatic breast cancer patients in the first
half of 2018; (iv) submitting neratinib for regulatory approval for
extended adjuvant HER-2 positive early stage breast cancer in certain
markets outside of the United States in the second half of 2018; (v)
reporting additional data from the Phase II CONTROL trial in the fourth
quarter of 2018; and (vi) reporting Phase II data from the SUMMIT basket
trial of neratinib in patients with HER2 mutations in the second half of
2018.”

Product Revenue

Net revenue consists of sales of NERLYNX, Puma’s first and only
commercial product to date. The FDA approved NERLYNX in July 2017 and
the Company commenced shipment to wholesalers in late July. For the
three and twelve months ended December 31, 2017, net revenue was
approximately $20.1 million and $26.2 million, respectively.

Operating Expenses

Operating expenses were $85.2 million for the fourth quarter of 2017,
compared to $72.9 million for the fourth quarter of 2016. Operating
expenses were $320.1 million for the full year 2017 compared to $276.6
million for the full year 2016.

Cost of Sales:

Cost of sales was $4.1 million for the fourth quarter and $5.6 million
for the twelve months ended December 31, 2017. The Company had no
product sales prior to the third quarter of 2017.

Selling, General and Administrative Expenses:

Selling, general and administrative expenses were $30.9 million for the
fourth quarter of 2017, compared to general and administrative expenses
of $16.5 million for the fourth quarter of 2016. Selling general and
administrative expenses for the full year 2017 were $106.7 million,
compared to general and administrative expenses of $53.8 million for the
full year 2016. The increase of approximately $52.9 million during the
full year 2017 compared to the same period in 2016 resulted primarily
from increases of approximately $16.1 million for the hiring and
training of our commercial sales force, $18.5 million in external costs
for the commercial launch of NERLYNX, $7.3 million in legal expenses,
$4.6 million in stock-based compensation, and approximately $5.0 million
in other internal expenses, such as increased headcount, software and
depreciation expenses.

Research and Development Expenses:

Research and development expenses were $50.2 million for the fourth
quarter of 2017, compared to $56.4 million for the fourth quarter of
2016. Research and development expenses for the full year 2017 were
$207.8 million, compared to $222.8 million for the full year 2016. The
decrease of approximately $15.0 million during the full year 2017
compared to the same period in 2016 resulted primarily from decreases of
approximately $13.1 million in stock-based compensation and $6.8 million
in manufacturing costs related to preparation of the commercial launch
of NERLYNX, offset by increases of approximately $1.0 million in
clinical study-related expense and $3.9 million in other internal
expenses, such as increased headcount, travel and software.

Conference Call

Puma Biotechnology will host a conference call to report its fourth
quarter and full year 2017 financial results and provide an update on
the company's business and outlook at 1:30 p.m. PST/4:30 p.m. EST on
Thursday, March 1, 2018. The call may be accessed by dialing
1-877-709-8150 (domestic) or 1-201-689-8354 (international) at least 10
minutes prior to the start of the call and referencing the “Puma
Biotechnology Conference Call.” A live webcast of the conference call
and presentation slides may be accessed on the Investors section of the
Puma Biotechnology website at http://www.pumabiotechnology.com/.
A replay of the call will be available approximately one hour after
completion of the call and will be archived on the company's website for
90 days.

About Puma Biotechnology

Puma Biotechnology, Inc. is a biopharmaceutical company with a focus on
the development and commercialization of innovative products to enhance
cancer care. The Company in-licenses the global development and
commercialization rights to three drug candidates — PB272 (neratinib,
oral), PB272 (neratinib, intravenous) and PB357. NERLYNX®
(neratinib, oral) is approved for commercial use by prescription in the
United States as extended adjuvant therapy for early stage HER2-positive
breast cancer following adjuvant trastuzumab-based therapy and is
marketed as NERLYNX. Neratinib is a potent irreversible tyrosine kinase
inhibitor that blocks signal transduction through the epidermal growth
factor receptors, HER1, HER2 and HER4. Currently, the Company is
primarily focused on the commercialization of NERLYNX and the continued
development of its other advanced drug candidates directed at the
treatment of HER2-positive breast cancer. The Company believes that
NERLYNX has clinical application in the potential treatment of several
other cancers that over-express or have a mutation in HER2.

This press release and the webcast of the presentation contain
forward-looking statements, including statements regarding the benefits
of NERLYNX and neratinib, the Company’s clinical trials and the
announcement of data relative to those trials. All forward-looking
statements involve risks and uncertainties that could cause the
Company’s actual results to differ materially from the anticipated
results and expectations expressed in these forward-looking statements.
These statements are based on current expectations, forecasts and
assumptions, and actual outcomes and results could differ materially
from these statements due to a number of factors, which include, but are
not limited to, the risk factors disclosed in the periodic and current
reports filed by the Company with the Securities and Exchange Commission
from time to time, including the Company’s Quarterly Report on Form 10-Q
for the quarter ended September 30, 2017. Readers are cautioned not to
place undue reliance on these forward-looking statements, which speak
only as of the date hereof. The Company assumes no obligation to update
these forward-looking statements, except as required by law.

PUMA BIOTECHNOLOGY, INC. AND SUBSIDIARY

CONSOLIDATED STATEMENTS OF OPERATIONS

(in millions except share and per share data)

Three Months Ended

Twelve Months Ended

December 31,

December 31,

(Unaudited)

(Unaudited)

2017

2016

2017

2016

Revenue, net

$

20.1

$

—

$

26.2

$

—

License revenue

1.5

—

1.5

—

Total revenue

21.6

—

27.7

—

Operating expenses:

Cost of sales

4.1

—

5.6

—

General and administrative

30.9

16.5

106.7

53.8

Research and development

50.2

56.4

207.8

222.8

Totals

85.2

72.9

320.1

276.6

Loss from operations

(63.6

)

(72.9

)

(292.4

)

(276.6

)

Other income (expenses):

Interest income

0.2

0.3

1.2

1.0

Interest expense

(0.7

)

—

(0.7

)

—

Other income (expense)

-

(0.1

)

(0.1

)

(0.4

)

Totals

(0.5

)

0.2

0.4

0.6

Net loss

$

(64.1

)

$

(72.7

)

$

(292.0

)

$

(276.0

)

Net loss per common share—basic and diluted

$

(1.71

)

$

(2.04

)

$

(7.85

)

$

(8.29

)

Weighted-average common shares outstanding—basic and diluted

37,534,410

35,694,193

37,169,678

33,295,114

PUMA BIOTECHNOLOGY, INC. AND SUBSIDIARY

LIQUIDITY AND CAPITAL RESOURCES

(in millions)

December 31,

December 31,

2017

2016

(unaudited)

(unaudited)

Cash and cash equivalents

$

81.7

$

194.5

Marketable securities

—

35.0

Working capital

48.1

199.0

Stockholders' equity

53.3

209.8

Twelve Months

Twelve Months

Ended

Ended

December 31,

December 31,

2017

2016

(unaudited)

(unaudited)

Cash provided by (used in):

Operating activities

$

(172.5

)

$

(141.7

)

Investing activities

(15.4

)

142.2

Financing activities

75.1

162.4

Increase (decrease) in cash and cash equivalents

$

(112.8

)

$

162.9

Non-GAAP Financial Measures

In addition to operating results as calculated in accordance with
generally accepted accounting principles, or GAAP, the Company uses
certain non-GAAP financial measures when planning, monitoring, and
evaluating operational performance. The following table presents the
Company’s net loss and net loss per share calculated in accordance with
GAAP and as adjusted to remove the impact of employee stock-based
compensation. For the three and twelve months ended December 31, 2017,
stock-based compensation represented approximately 39.8% and 37.2% of
net loss, respectively. Although net loss is important to measure
financial performance, the Company currently places an emphasis on cash
burn and, more specifically, cash used in operations. Stock-based
compensation appears in GAAP net loss but is removed from net loss to
arrive at cash used in operations on the statement of cash flows. Due to
its noncash nature, the Company believes these non-GAAP measures enhance
understanding of financial performance, are more indicative of
operational performance and facilitate a better comparison among fiscal
periods. These non-GAAP financial measures are not, and should not be
viewed as, substitutes for GAAP reporting measures.

PUMA BIOTECHNOLOGY, INC. AND SUBSIDIARY

Reconciliation of GAAP Net Loss to Non-GAAP Adjusted Net Loss and

GAAP Net Loss Per Share to Non-GAAP Adjusted Net Loss Per Share

(in millions except share and per share data)

(Unaudited)

Three Months Ended December 31,

2017

2016

GAAP net loss

$

(64.1

)

$

(72.7

)

Adjustments:

Stock-based compensation -

General and administrative

8.2

6.9

(1

)

Research and development

17.3

22.4

(2

)

Non-GAAP adjusted net loss

$

(38.6

)

$

(43.4

)

GAAP net loss per share - basic and diluted

$

(1.71

)

$

(2.04

)

Adjustment to net loss (as detailed above)

0.68

0.82

Non-GAAP adjusted net loss per share

$

(1.03

)

$

(1.22

)

(3

)

Twelve Months Ended December 31,

2017

2016

GAAP net loss

$

(292.0

)

$

(276.0

)

Adjustments:

Stock-based compensation -

General and administrative

31.2

26.6

(1

)

Research and development

77.5

90.6

(2

)

Non-GAAP adjusted net loss

$

(183.3

)

$

(158.8

)

GAAP net loss per share - basic and diluted

$

(7.85

)

$

(8.29

)

Adjustment to net loss (as detailed above)

2.92

3.52

Non-GAAP adjusted net loss per share

$

(4.93

)

$

(4.77

)

(4

)

(1)

To reflect a non-cash charge to operating expense for General and
Administrative stock-based compensation.

(2)

To reflect a non-cash charge to operating expense for Research and
Development stock-based compensation.

(3)

Non-GAAP adjusted net loss per share was calculated based on
37,534,410 and 35,694,193 weighted average common shares outstanding
for the three months ended December 31, 2017 and 2016, respectively.

(4)

Non-GAAP adjusted net loss per share was calculated based on
37,169,678 and 33,295,114 weighted average common shares outstanding
for the twelve months ended December 31, 2017 and 2016, respectively.